"Google Authenticator" style 2fa is an open spec. You can build your own authenticator to your own liking. So no, "by that logic" doesn't apply. You can choose

"Google Authenticator" style 2fa is an open spec. You can build your own authenticator to your own liking. So no, "by that logic" doesn't apply. You can choose to use something else than a phone to auth, but if it's SMS based well... I just came back from a week in France where I had zero cell connectivity. Had I been using any kind of SMS based 2fa, I would have lost access to those accounts with no forewarning.